Howdy,
This iPhone application has been brought to my attention on the
TeXShop Forum. Thought I'd pass it on. The claim is that after getting
the equation the way you want you can e-mail the LaTeX code to
yourself and use it in LaTeX documents. Costs $9.99. Here's the link: <http://www.sunsetlakesoftware.com/picubed
>.
Good Luck,
Herb Schulz
(herbs at wideopenwest dot com)